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From "Timothy Bish (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (AMQ-1853) Optional non-blocking redelivery
Date Fri, 28 Oct 2011 21:11:33 GMT

    [ https://issues.apache.org/jira/browse/AMQ-1853?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13138755#comment-13138755
] 

Timothy Bish commented on AMQ-1853:
-----------------------------------

@Susan.  If the new test differs from the one in the original patch you need to upload again
and tick the grant license to apache.  Note that I tested against the original patch tests
with the addition of the option jms.nonBlockingRedelivery for the nonblocking test case and
it works fine.
                
> Optional non-blocking redelivery
> --------------------------------
>
>                 Key: AMQ-1853
>                 URL: https://issues.apache.org/jira/browse/AMQ-1853
>             Project: ActiveMQ
>          Issue Type: Wish
>          Components: Broker
>    Affects Versions: 5.1.0
>            Reporter: Demian Mrakovich
>            Assignee: Timothy Bish
>             Fix For: 5.6.0
>
>         Attachments: AMQ1853Test.java, AMQ1853UnitTest.patch
>
>
> When a message is redelivered the consumer blocks for the amount of time specified by
the redelivery delay. For a high load scenario where message order is irrelevant this is just
reducing performance and will result in a complete halt if the delay is long and several bad
messages are consumed in a short time. 
> I think what I basically wish for is how it worked in versions 3.x, prior to fix for
AMQ-268. So I would very much like to have configurable option to NOT block consumers when
redelivering messages. 
> If no-one feels up to it, I'd still appreciate some hints and I could try to fix it myself.
Looking at ActiveMQMessageConsumer.rollback(), I was thinking something in the lines of just
scheduling a task to put the message back on queue after a delay - if configured to, instead
of stopping delivery and a schedule a task to resume delivery again. But I do not possess
an understanding of AMQ thorough enough to predict potential side effects of this, so any
analysis would be helpful.

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